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论文采用多相流模型对重力作用下Al Si 7% (质量分数 ) /SiC颗粒功能梯度材料二维凝固过程进行了数值模拟 .计算了在不含颗粒、含有小尺寸颗粒和含有大尺寸颗粒几种不同条件下颗粒和液相的运动 ,产生的宏观偏析 ,共晶合金在晶体中所占比例 ,以及最终的颗粒分布 .结果表明 ,颗粒和糊状区的存在会使液态金属的流动阻力增大 ,流速降低 ,产生的宏观偏析减弱 .在含有小尺寸颗粒的情况下 ,液相和颗粒运动速度很小 ,大部分区域保持初始颗粒体积分数不变 .在含有大尺寸颗粒的情况下 ,颗粒沉降速度很快 ,在底部形成颗粒堆积区 ,在上部形成颗粒体积分数为零区 .
The multi-phase flow model is used to simulate the two-dimensional solidification process of graded Al 7% (mass fraction) / SiC functional graded material under the action of gravity.It is calculated that the particle size distribution of particles containing small particles and large particles The movement of particles and liquid phase under different conditions, macroscopic segregation, the proportion of eutectic alloy in the crystal, and the final particle distribution were studied.The results show that the presence of particles and pasty zone will increase the flow resistance of liquid metal by Large, the flow rate decreases, the resulting macro-segregation weakened in the case of small particles, the liquid and particle velocity is very small, most of the region to maintain the initial particle volume fraction unchanged in the case of particles containing large size, the particles Settling speed is very fast, at the bottom of the formation of particle accumulation zone, the formation of particles in the upper part of the volume fraction of zero.